This paper introduces a novel Space Vector Pulse Width Amplitude Modulation (SVPWAM) technique tailored for a buck–boost voltage/current source inverter. Comparative analysis with conventional Sinusoidal Pulse Width Modulation (SPWM) reveals an 87% reduction in switching loss for the voltage source inverter and a 60% reduction for the current source inverter. Concurrently, the power density experiences a 2 to 3-fold increase. Furthermore, empirical validation demonstrates that the output harmonic distortions of SVPWAM are lower than those of SPWM, utilizing only one-third of the latter's switching frequency. Consequently, employing SVPWAM renders the buck–boost inverter suitable for applications necessitating high efficiency, elevated power density, tolerance to high temperatures, and cost-effectiveness. Prominent applications encompass electric vehicle motor drives or engine starter/alternator systems. Index Terms—Buck-boost, SVPWAM, reduction in switching loss, Total Harmonic Distortion (THD)